{"id":4153,"date":"2020-09-30T23:07:39","date_gmt":"2020-09-30T17:37:39","guid":{"rendered":"https:\/\/golangbyexamples.com\/?p=4153"},"modified":"2020-09-30T23:07:53","modified_gmt":"2020-09-30T17:37:53","slug":"character-constant-golang","status":"publish","type":"post","link":"https:\/\/golangbyexamples.com\/character-constant-golang\/","title":{"rendered":"Character constant in Go (Golang)"},"content":{"rendered":"\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_17 counter-hierarchy counter-decimal ez-toc-light-blue\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" style=\"display: none;\"><i class=\"ez-toc-glyphicon ez-toc-icon-toggle\"><\/i><\/a><\/span><\/div>\n<nav><ul class=\"ez-toc-list ez-toc-list-level-1\"><li class=\"ez-toc-page-1 ez-toc-heading-level-1\"><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/golangbyexamples.com\/character-constant-golang\/#Overview\" title=\"Overview\">Overview<\/a><\/li><li class=\"ez-toc-page-1 ez-toc-heading-level-1\"><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/golangbyexamples.com\/character-constant-golang\/#Example\" title=\"Example\">Example<\/a><ul class=\"ez-toc-list-level-2\"><li class=\"ez-toc-heading-level-2\"><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/golangbyexamples.com\/character-constant-golang\/#Typed_character_constant\" title=\"Typed character constant\">Typed character constant<\/a><\/li><li class=\"ez-toc-page-1 ez-toc-heading-level-2\"><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/golangbyexamples.com\/character-constant-golang\/#Untyped_named_character_constant\" title=\"Untyped named character constant\">Untyped named character constant<\/a><\/li><li class=\"ez-toc-page-1 ez-toc-heading-level-2\"><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/golangbyexamples.com\/character-constant-golang\/#Untyped_unnamed_character_constant\" title=\"Untyped unnamed character constant\">Untyped unnamed character constant<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h1 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Overview\"><\/span><strong>Overview<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h1>\n\n\n\n<p class=\"has-medium-font-size\">In go character constant is represented as a value between single quotes. Refer this article to understand character in golang better in general<br><\/p>\n\n\n\n<p class=\"has-medium-font-size\">Also to better understand character constant in golang it is important to understand typed and untyped constant in go. Please refer to this article for that &#8211; <a href=\"https:\/\/golangbyexamples.com\/typed-untyped-constant-golang\">https:\/\/golangbyexamples.com\/typed-untyped-constant-golang<\/a>\/<\/p>\n\n\n\n<p class=\"has-medium-font-size\">Once you have gone through the article you would have understood that constant can be declared in three ways<\/p>\n\n\n\n<ul class=\"has-medium-font-size wp-block-list\"><li>Typed&nbsp; constant<\/li><li>Untyped unnamed&nbsp; constant<\/li><li>Untyped named constant<\/li><\/ul>\n\n\n\n<p class=\"has-medium-font-size\">It is the same case with character as well. Let&#8217;s see a program to understand it<\/p>\n\n\n\n<h1 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Example\"><\/span><strong>Example<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h1>\n\n\n\n<p class=\"has-medium-font-size\">Below is the program illustrating a character constant.<\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">package main\n\nimport \"fmt\"\n\nfunc main() {\n\ttype myChar int32\n\n\t\/\/Typed character constant\n\tconst aa int32 = 'a'\n\tvar uu = aa\n\tfmt.Println(\"Untyped unnamed character constant\")\n\tfmt.Printf(\"uu: Type: %T Value: %v\\n\\n\", uu, uu)\n\n\t\/\/Below line will raise a compilation error\n\t\/\/var vv myBool = aa\n\n\t\/\/Untyped named character constant\n\tconst bb = 'a'\n\n\tvar ww myChar = bb\n\tvar xx = bb\n\tfmt.Println(\"Untyped named character constant\")\n\tfmt.Printf(\"ww: Type: %T Value: %v\\n\", ww, ww)\n\tfmt.Printf(\"xx: Type: %T Value: %v\\n\\n\", xx, xx)\n\n\t\/\/Untyped unnamed character constant\n\tvar yy myChar = 'a'\n\tvar zz = 'a'\n\tfmt.Println(\"Untyped unnamed character constant\")\n\tfmt.Printf(\"yy: Type: %T Value: %v\\n\", yy, yy)\n\tfmt.Printf(\"zz: Type: %T Value: %v\\n\", zz, zz)\n}<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\"><strong>Output:<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">Untyped unnamed character constant\nuu: Type: int32 Value: 97\n\nUntyped named character constant\nww: Type: main.myChar Value: 97\nxx: Type: int32 Value: 97\n\nUntyped unnamed character constant\nyy: Type: main.myChar Value: 97\nzz: Type: int32 Value: 97<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\">In the above program, we created a new type\u00a0 <strong>myChar<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">type myChar int32<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\">Also above program shows the example of<\/p>\n\n\n\n<ul class=\"has-medium-font-size wp-block-list\"><li>Typed character constant<\/li><li>Untyped unnamed character constant<\/li><li>Untyped named character constant<\/li><\/ul>\n\n\n\n<p class=\"has-medium-font-size\">Let&#8217;s understand each of them and their behaviour<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Typed_character_constant\"><\/span><strong>Typed character constant<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"has-medium-font-size\">It is defined as below<\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">const aa int32 = 'a'<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\">Notice in above that below line will cause a compilation error. This is because variable <strong>aa<\/strong> is of type <strong>int32<\/strong>. So below line will cause compilation error as it cannot be assigned to variable of type <strong>myChar<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">var v myChar = aa<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\">But typed string constant can be assigned to a variable created with <strong>var<\/strong> keyword like below<\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">var uu = aa<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Untyped_named_character_constant\"><\/span><strong>Untyped named character constant<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"has-medium-font-size\">It is defined as below<\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">const bb = 'a'<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\">Untyped named string constant\u00a0 can be assigned to variable of type <strong>myChar<\/strong> as well variable created with <strong>var<\/strong> keyword because it is untyped so type of the constant will be decided depending upon the type of variable they are being assigned to.<\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">var ww myChar = bb\nvar xx = bb<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Untyped_unnamed_character_constant\"><\/span><strong>Untyped unnamed character constant<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"has-medium-font-size\">It is like below<\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">'a'<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\">Untyped unnamed string constant can be assigned to variable of type <strong>myChar<\/strong> as well variable created with <strong>var<\/strong> keyword because it is untyped so type of the constant will be decided depending upon the type of variable they are being assigned to.<\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">var yy myChar = 'a'\nvar zz = 'a'<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>Table of Contents OverviewExampleTyped character constantUntyped named character constantUntyped unnamed character constant Overview In go character constant is represented as a value between single quotes. Refer this article to understand character in&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"spay_email":"","footnotes":"","jetpack_publicize_message":"","jetpack_is_tweetstorm":false},"categories":[1],"tags":[3,4],"class_list":["post-4153","post","type-post","status-publish","format-standard","hentry","category-tech","tag-go","tag-golang"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.7 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Character constant in Go (Golang) - Welcome To Golang By Example<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/golangbyexamples.com\/character-constant-golang\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Character constant in Go (Golang) - Welcome To Golang By Example\" \/>\n<meta property=\"og:description\" content=\"Table of Contents OverviewExampleTyped character constantUntyped named character constantUntyped unnamed character constant Overview In go character constant is represented as a value between single quotes. 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